1 // Auto-generated file. Do not edit!
2 // Template: src/f32-vsqrt/fma3-nr1fma1adj.c.in
3 // Generator: tools/xngen
4 //
5 // Copyright 2020 Google LLC
6 //
7 // This source code is licensed under the BSD-style license found in the
8 // LICENSE file in the root directory of this source tree.
9
10 #include <assert.h>
11
12 #include <immintrin.h>
13
14 #include <xnnpack/common.h>
15 #include <xnnpack/vunary.h>
16
17
xnn_f32_vsqrt_ukernel__fma3_nr1fma1adj_x8(size_t n,const float * x,float * y,const union xnn_f32_sqrt_params params[restrict XNN_MIN_ELEMENTS (1)])18 void xnn_f32_vsqrt_ukernel__fma3_nr1fma1adj_x8(
19 size_t n,
20 const float* x,
21 float* y,
22 const union xnn_f32_sqrt_params params[restrict XNN_MIN_ELEMENTS(1)])
23 {
24 assert(n != 0);
25 assert(n % sizeof(float) == 0);
26
27 const __m256 vhalf = _mm256_load_ps(params->fma.half);
28 for (; n >= 8 * sizeof(float); n -= 8 * sizeof(float)) {
29 const __m256 vx = _mm256_loadu_ps(x);
30 x += 8;
31
32 const __m256 vrsqrtx = _mm256_rsqrt_ps(vx);
33 __m256 vsqrtx = _mm256_mul_ps(vrsqrtx, vx);
34 __m256 vhalfrsqrtx = _mm256_mul_ps(vrsqrtx, vhalf);
35 const __m256 vresidual = _mm256_fnmadd_ps(vsqrtx, vhalfrsqrtx, vhalf);
36 vhalfrsqrtx = _mm256_fmadd_ps(vhalfrsqrtx, vresidual, vhalfrsqrtx);
37 vsqrtx = _mm256_fmadd_ps(vsqrtx, vresidual, vsqrtx);
38 const __m256 vadjustment = _mm256_fnmadd_ps(vsqrtx, vsqrtx, vx);
39 const __m256 vy = _mm256_fmadd_ps(vhalfrsqrtx, vadjustment, vsqrtx);
40
41 _mm256_storeu_ps(y, vy);
42 y += 8;
43 }
44 if XNN_UNLIKELY(n != 0) {
45 assert(n >= 1 * sizeof(float));
46 assert(n <= 7 * sizeof(float));
47 const __m256i vmask = _mm256_loadu_si256((const __m256i*) ((uintptr_t) ¶ms->fma.mask_table[7] - n));
48
49 const __m256 vx = _mm256_maskload_ps(x, vmask);
50
51 const __m256 vrsqrtx = _mm256_rsqrt_ps(vx);
52 __m256 vsqrtx = _mm256_mul_ps(vrsqrtx, vx);
53 __m256 vhalfrsqrtx = _mm256_mul_ps(vrsqrtx, vhalf);
54 const __m256 vresidual = _mm256_fnmadd_ps(vsqrtx, vhalfrsqrtx, vhalf);
55 vhalfrsqrtx = _mm256_fmadd_ps(vhalfrsqrtx, vresidual, vhalfrsqrtx);
56 vsqrtx = _mm256_fmadd_ps(vsqrtx, vresidual, vsqrtx);
57 const __m256 vadjustment = _mm256_fnmadd_ps(vsqrtx, vsqrtx, vx);
58 const __m256 vy = _mm256_fmadd_ps(vhalfrsqrtx, vadjustment, vsqrtx);
59
60 __m128 vy_lo = _mm256_castps256_ps128(vy);
61 if (n & (4 * sizeof(float))) {
62 _mm_storeu_ps(y, vy_lo);
63 vy_lo = _mm256_extractf128_ps(vy, 1);
64 y += 4;
65 }
66 if (n & (2 * sizeof(float))) {
67 _mm_storel_pi((__m64*) y, vy_lo);
68 vy_lo = _mm_movehl_ps(vy_lo, vy_lo);
69 y += 2;
70 }
71 if (n & (1 * sizeof(float))) {
72 _mm_store_ss(y, vy_lo);
73 }
74 }
75 }
76